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Śrī Caitanya-caritāmṛta
[Madhya-līlā, Ch. 8]
ānanda-cin-maya-rasa-pratibhāvitābhis tābhir ya eva ṇija-rūpatayā kalābhiḥ goloka eva nivasaty akhilātma-bhūto govindam ādi-puruṣaṁ tam ahaṁ bhajāmi
“I worship Govinda, the primeval Lord. He resides in His own realm, Goloka, with Rādhā, who resembles His own spiritual figure and who embodies the ecstatic potency [ hlādinī ]. Their companions are Her confidantes, who embody extensions of Her bodily form and who are imbued and permeated with ever-blissful spiritual  rasa .”
The  gopīs  are also of the same spiritual quality ( nija-rūpatayā ) because they are expansions of Kṛṣṇa’s pleasure potency. Neither Kṛṣṇa nor the  gopīs  have anything to do with lumps of matter or the material conception. In the material world, the living entity is encaged within a material body, and due to ignorance he thinks that he is the body. Lusty desire, enjoyment between male and female, is all material. One cannot compare the lusty desires of a materialistic man to the lusty desires of Kṛṣṇa. Unless one is advanced in spiritual science, he cannot understand the lusty desires between Kṛṣṇa and the  gopīs . In  Caitanya-caritāmṛta  the lusty desire of the  gopīs  is compared to gold. The lusty desires of a materialistic man, on the other hand, are compared to iron. At no stage can iron and gold be compared. The living entities—moving and nonmoving—are part and parcel of Kṛṣṇa; therefore they originally have the same kind of lusty desire. However, when this lusty desire is expressed through matter, it is abominable. When a living entity is spiritually advanced and liberated from material bondage, he can understand Kṛṣṇa in truth. As stated in  Bhagavad-gītā :
janma karma ca me divyam evaṁ yo vetti tattvataḥ tyaktvā dehaṁ punar janma naiti mām eti so ‘rjuna
“One who knows the transcendental nature of My appearance and activities does not, upon leaving the body, take his birth again in this material world, but attains My eternal abode, O Arjuna.” (Bg. 4.9)
When one can understand the body of Kṛṣṇa as well as the Lord’s lusty desires, one is immediately liberated. A conditioned soul encaged within the material body cannot understand Kṛṣṇa. As stated in  Bhagavad-gītā :
manuṣyāṇāṁ sahasreṣu kaścid yatati siddhaye yatatām api siddhānāṁ kaścin māṁ vetti tattvataḥ